Used 390cc Four-Stroke Enduro Bikes To Buy in 2025

It’s no secret that 350cc four-strokes are a popular choice for motocross, off-road, and dual sport riders alike. They’re an exact middle ground displacement for MX (between 250cc and 450cc four-strokes), seem to be the ideal engine size for cross-country and enduro riding and racing, and have enough power to connect trails on pavement for those who enjoy dual sporting.

But there are riders who want more power than a 350cc thumper but realize a 450cc can be a bit much to handle, especially off-road. Such individuals are in luck because Beta has a couple of unique displacements between 350cc and 450cc thumpers in the enduro (i.e., headlight-equipped off-road-only) space, the smaller of which are 390s (which technically have a displacement of 386cc). The two models with such engines have been around for over a decade now, and such tenure makes one or more likely to pop up on the secondhand market at any time.

For those who want a used 390 thumper to be ridden only off-road, this article might help you determine which is best for your needs.

The 390 RR’s first year in Beta’s lineup was 2015. Since then, it’s been the second-smallest-displacement standard-model four-stroke enduro from the Italian manufacturer, and is a good choice for those who want something with more low-end grunt than a 350cc four-stroke enduro (like Beta’s 350 RR) but less power than a larger-displacement model like Beta’s 430 RR and those in the 450cc enduro category.

If the ZF Sachs 48mm open-cartridge coil-spring fork on 2024 and prior versions of Beta’s 390 RR (and ZF Sachs Separate Hydraulic Chamber (SHC) 48mm coil-spring fork on 2025 and 2026 models) as well as a ZF Sachs shock doesn’t do it for you but you still want a model of the same displacement, the 390 RR Race Edition might be right up your alley. It’s utilized a KYB Air-Oil Separate (AOS) 48mm closed-cartridge coil-spring fork since 2020 and KYB shock since 2023—suspension that has an excellent reputation for combining plushness and performance. The Italian manufacturer specs these well-known components to make the 390 RR Race Edition better suited for off-road competition.